Of course, little is still known about the features that Redstone 1 and 2 will bring. We've seen some new features in the Insider Preview builds, but they're all either minor features or have since been brought over to Production builds.

Rumors of what will be included in Redstone are OneDrive placeholders, Edge extensions, Universal Windows Apps on Xbox One, Bluetooth keyboard and mouse support for Xbox One, windowed apps for Continuum for phones, and more. Of course, Microsoft is likely waiting until Build to announce some of the big features.